1 files changed, 3 insertions, 7 deletions

diff --git a/drivers/isdn/pcbit/drv.c b/drivers/isdn/pcbit/drv.c
index 123c1d6c43b4..1507d2e83fbb 100644
--- a/drivers/isdn/pcbit/drv.c
+++ b/drivers/isdn/pcbit/drv.c
@@ -411,14 +411,10 @@ static int pcbit_writecmd(const u_char __user *buf, int len, int driver, int cha
                         return -EINVAL;
                 }
 
-                cbuf = kmalloc(len, GFP_KERNEL);
-                if (!cbuf)
-                        return -ENOMEM;
+                cbuf = memdup_user(buf, len);
+                if (IS_ERR(cbuf))
+                        return PTR_ERR(cbuf);
 
-                if (copy_from_user(cbuf, buf, len)) {
-                        kfree(cbuf);
-                        return -EFAULT;
-                }
                 memcpy_toio(dev->sh_mem, cbuf, len);
                 kfree(cbuf);
                 return len;